Ultra-low quiescent dissipation LDO circuit and ultra-low quiescent dissipation LDO circuit for driving heavy load

Abstract

The invention discloses an ultra-low quiescent dissipation LDO circuit. The LDO circuit includes a voltage output end for outputting a modulated stabilized voltage, a power transistor loop module which is connected to a power supply and connected with the voltage output end, a grounded resistance feedback loop module which is connected with the power transistor loop module, a gain amplification-level module which is connected to a reference voltage and connected with the resistance feedback loop module and the power transistor loop module, and a grounded leak current absorption module which isconnected with the power transistor loop module. The LDO circuit can absorb leak current generated by the circuit when a load current is zero so that a quiescent current can be released, it is prevented that the output voltage rises due to the resistance feedback loop module with a high resistance, the service life of the load circuit can be prolonged, and meanwhile, the stability of the output voltage is ensured.

Description

technical field [0001] The invention relates to the field of DC-DC devices, in particular to an LDO circuit with ultra-low static power consumption. Background technique [0002] With the development of science and technology, more and more electronic products have become indispensable in our lives. Commonly used handheld electronic devices such as mobile phones and digital cameras have widely used LDO circuits, that is, low-dropout linear stabilizers. It can provide a safe and stable DC regulated power supply for the load. With the improvement of energy saving and environmental protection requirements, the demand for low static power consumption LDO is increasing; in some ultra-low power consumption applications such as the Internet of Things, handheld devices, etc., The system needs an LDO with static power consumption at the nA level to improve energy efficiency; however, under the existing technology, the leakage current of the device itself is at the nA level, which wil...

AI Technical Summary

Problems solved by technology

[0002] With the development of science and technology, more and more electronic products have become indispensable in our lives. Commonly used handheld electronic devices such as mobile phones and digital cameras have widely used LDO circuits, that is, low-dropout linear stabilizers. It can provide a safe and stable DC regulated power supply for the load. With the improvement of energy saving and environmental protection requirements, the demand for low static power consumption LDO is increasing; in some ultra-low power

Images